Scalar builtin function not compatible with expressions

The following code is expected to work:

s = (numbers: 1, 2)
print(2*sum(s))

Instead, an error occurs:

Syntax error: None:2:10 -->  print(2* *sum(s))  <--
Expected '+' or '-' or 'Number' or STRICTFLOAT or INT or '('

In the same logic the following code also does not work:

b = (bools: true, false)
print(not all(b))

The error is:

Syntax error: None:6:11 --> print(not *all(b))  <--
Expected 'Bool' or BOOL or '('

It is rather a none-feature than a bug. Mixing scalar built-in functions (with some exceptions such as the if-function) is not allowed in the grammar.